What is medical billing code 99286?

According to this info, it is an ortho code, according to something else, it is in the Emergency range. i can't find a reimb on my addm b for it.

CPT® and RBRVS 2012 Annual Symposium November 16-18, 2012 Orthopaedic and Spine

American Academy of Orthopaedic Surgery,

AMA/Specialty Society Relative Value Scale

99286 - Arthroscopic subacromial decompression

The descriptor has changed from

Arthroscopy, shoulder, surgical; decompression of subacromial space with partial acromioplasty, with or without coracoacromial release to

Arthroscopy, shoulder, surgical; decompression of subacromial space with partial acromioplasty, with coracoacromial ligament (ie, arch) release, when performed (List separately in addition to code for primary procedure)